<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
  <style>
    .wrap {
      width: 100%;
      display: flex;
      margin: 0.2rem 0 0 0;
      position: relative;
    }

    /*左侧的导航样式*/
    .nav_left {
      width: 21.1875rem;
      overflow: scroll;
    }

    .nav_left::-webkit-scrollbar {
      display: none;
    }

    .nav_content {
      white-space: nowrap;
      padding: 0 0.7rem;
    }

    .nav_content span {
      display: inline-block;
      padding: 0.4rem 0.6rem;
      font-size: 0.875rem;
    }

    .nav_content .active {
      border-bottom: 2px solid #7f4395;
      color: #7f4395;
    }

    .nav_left,
    .down {
      float: left;
    }

    /*右侧导航部分*/
    .down {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .gray {
      color: gray;
      display: inline-block;
      vertical-align: middle;
    }
  </style>
</head>

<body>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="addStudent.name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="addStudent.age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="addStudent.sex">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click.trim="addOrEdit">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0" v-if="studentInfo.length">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item,index) in studentInfo" :key="index">
          <td>{{index+1}}</td>
          <td>{{item.name}}</td>
          <td>{{item.age}}</td>
          <td>{{item.sex}}</td>
          <td>
            <button @click="del(index)">删除</button>
            <button @click="edit(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        addStudent: {
          name: '',
          age: '',
          sex: ''
        },
        editIndex: null,
        studentInfo: [
          {
            name: "Tom",
            age: 19,
            sex: "男",
          },
          {
            name: "Jone",
            age: 21,
            sex: "女",
          },
        ]
      },
      methods: {
        addOrEdit () {
          if (this.addStudent.name !== '') {
            if (this.editIndex !== null) {
              this.studentInfo.splice(this.editIndex, 1, { ...this.addStudent })
              this.editIndex = null
            } else {
              this.studentInfo.push({ ...this.addStudent })
            }
            this.addStudent.name = ''
            this.addStudent.age = ''
            this.addStudent.sex = ''
          } else {
            alert('内容不能为空')
          }
        },
        del (index) {
          this.studentInfo = this.studentInfo.filter((i, ind) => ind !== index)
        },
        edit (index) {
          const re = this.studentInfo.find((i, ind) => ind === index)
          console.log(re)
          this.editIndex = index
          this.addStudent.name = re.name
          this.addStudent.age = re.age
          this.addStudent.sex = re.sex
        }
      }
    })
  </script>
</body>

</html>